From owner-freebsd-hardware Sun Apr 14 13:25:38 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id NAA11858 for hardware-outgoing; Sun, 14 Apr 1996 13:25:38 -0700 (PDT) Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id NAA11850 for ; Sun, 14 Apr 1996 13:25:33 -0700 (PDT) Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.12/8.6.9) id GAA01207; Mon, 15 Apr 1996 06:20:21 +1000 Date: Mon, 15 Apr 1996 06:20:21 +1000 From: Bruce Evans Message-Id: <199604142020.GAA01207@godzilla.zeta.org.au> To: dk+@ua.net, phk@critter.tfs.com Subject: Re: building parallel interface gadget - advice wanted Cc: freebsd-hardware@FreeBSD.org Sender: owner-hardware@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk >> from my understanding, for the data byte t obe output into the (real) >> printer, it is necessary to assert select, !initialize and strobe >> bits of control register and then lower the signal on the strobe pin, >> leaving select and !initialize high. Can it be possible that the >> same situation unwantedly occurs during system reset (power-on, reset >> by switch, software-executed reboot, etc.)? >Not only possible, but also very likely. The parallel port is used by >man BIOS's as a status port for diagnostics early in the boot sequence. It shouldn't strobe any data out because that would waste paper. Bruce